Washington is not a high risk; and most houses are wood frame construction, so there is quite a lot of 'give'.
Other than 9+ magnitude earthquakes every now and then, magma flows, volcanoes, floods including the Great Missoula, 100 mph+ windstorms that take out floating bridges, not much risk.
They know that if they go dropping coverage in DC hell will be upon them lol. If you thought they were pissed because exercising a search warrant on a congressman suspected of a felony was bad, just let them lose insurance on that $5,000,000 house they HAVE to live in while congress is in session.